Which sentence is an example of faulty coordination?
A.
During World War II, Great Britain developed prototypes of advanced flyer planes, and so did Germany.
B.
In the Battle of Britain, the British air force and the German air force fought fiercely.
C.
Few B-17s were in service when the United States entered World War II, but production of the planes accelerated soon after.
D.
The German air force defeated the Polish air force and bombed major Polish cities, and World War II began in 1939.